Finite impulse response filtering for an adaptive modulation wireless communication system

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EP 1 770 891 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	09.11.2011 Bulletin 2011/45

(43)	Date of publication A2:
	04.04.2007 Bulletin 2007/14

(21)	Application number: 06077191.2

(22)	Date of filing: 28.07.2000

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International Patent Classification (IPC):

H04L 1/00^(2006.01)
H04B 7/26^(2006.01)

H04L 27/00^(2006.01)
H04L 25/03^(2006.01)

(84)	Designated Contracting States:
	AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
	Designated Extension States:
	AL LT LV MK RO SI

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Priority:

03.08.1999 US 365917

(62)	Application number of the earlier application in accordance with Art. 76 EPC:
	00950837.5 / 1221216

(71)	Applicant: WI-LAN, Inc.
	Ottawa ON K1Y 4S1 (CA)

(72)	Inventors:
	Klein, Israel Jay San Diego, CA 92122 (US) Stanwood, Kenneth L. Cardiff by the Sea, CA 92007 (US) Pollman, Steve Santee, CA 92071 (US) Price, Frederick W. Carlsbad, CA 92009 (US) Hadar, Rami San Diego, CA 92122 (US) Arviv, Eli Modi'in (IL) Gazelle, David Givat Shumel (IL) Gilbert, Sheldon San Diego, CA 92130 (US)

(74)	Representative: Harding, Richard Patrick et al
	Marks & Clerk LLP 4220 Nash Court Oxford Business Park South Oxford OX4 2RU Oxford Business Park South Oxford OX4 2RU (GB)

(54)	Finite impulse response filtering for an adaptive modulation wireless communication system

(57) The present invention relates to a method of updating the weights of a FIR filter where the filter processes symbols having variable modulation rates. When the modulation rate of the incoming symbols changes, the weights corresponding to the first symbol having the new modulation rate are changed based as the symbol propagates through the filter.

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